Abstract

Nanocarbon-doped Fe-sheathed tapes with different doping levels were prepared by the in situ powder-in-tube method. Compared to the undoped tapes, for all the C-doped samples was enhanced by more than an order of magnitude in magnetic fields above . At , the transport for the doped tapes reached at and at , respectively. Moreover, the critical temperature for the doped tapes decreased slightly. Transmission electron microscopy showed a number of intragranular dislocations and the dispersed nanoparticles embedded within grains induced by the C doping. The mechanism for the enhancement of flux pinning is also discussed. These results indicate that powder-in-tube-processed tape is very promising for high-field applications.

Received 04 December 2005Accepted 18 January 2006Published online 13 February 2006

Acknowledgments:

The authors thank Yulei Jiao, Ling Xiao, Xiaohang Li, Hongli Suo, Haihu Wen, and Liye Xiao for their help and useful discussions. This work was partially supported by the National Science Foundation of China (NSFC) under Grant Nos. 50472063 and 50377040 and National “973” Program (Grant No. 2006CB601004).